American Bridge 21st Century, a Democratic super PAC, has posted a 555-page opposition research file on Sen. Marco Rubio as Mitt Romney nears a decision on his VP pick.

"Once Rubio is revealed to be neither the Tea Party champion or draw for Hispanic voters that Romney is counting on, what's left is an inexperienced freshman Senator who brings little to the ticket," the group says.

The report is mostly an exhaustive summary of Rubio's votes as a Florida House member along with his less than two years in the U.S. Senate. It doesn't appear to break any ground but rather shows the depth of which VP candidates are vetted by the opposition.

The report is here.